Role of narrow band imaging in endoscopic submucosal dissection

Figure 4 The development of narrow band imaging facilitated the visual observation of intra-epithelial papillary capillary loop, revolutionizing the diagnosis of the depth. A: Findings of narrow band imaging-combined magnifying observation of a lesion diagnosed as M2 after endoscopic submucosal dissection (ESD). Dilated and curving intra-epithelial papillary capillary loop (IPCL) with an irregular width extending in a transverse direction; B: Findings of narrow band imaging-combined magnifying observation of a lesion diagnosed as M3 after ESD. IPCL was severely damaged , and a connection with the adjacent IPCL was also observed.